Earthquakes and Tsunamis - Civil Engineering Disaster Mitigation Activities - Implementing Millennium Development Goals




1 Background

One of the main problems in rehabilitating reinforced concrete structures in seismic

zones is the development of procedures that are inexpensive and do not substantially

change the appearance or the usage of a structure. For frame elements, two

problems that are common in structures that were designed and built prior to

the late 1960’s are the lack of continuity of bottom beam reinforcement through

beam-column connections and column splices that were designed to carry compression

only. In many cases, the structures were designed to carry only vertical

loads so that positive beam moments at a joint were not likely and columns carried

only compressive loads. However, moment reversals will occur in the beams

and the columns and the longitudinal reinforcement may reach yield during an

earthquake.

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